YINCHUAN, June 17, 2016 (Xinhua) -- Firemen spray water during a drill at the Ningdong Energy and Chemical Industry Base in Yinchuan, capital of northwest China's Ningxia Hui Autonomous Region, June 17, 2016. More than 200 firemen and 57 fire engines from Yinchuan Fire Brigade participated in a drill on Friday to improve their ability to fight against fire at energy and chemical industry area. (Xinhua/Li Ran)